这种物质很容易由甲醛和肼反应而得到.The material is readily prepared by reaction of formaldehyde and hydrazine.甲醛能慢慢使多种病毒失去活性.Formaldehyde slowly inactivates many viruses.二氧化硫和甲醛都可产生刺激.Sulfur dioxide and formaldehyde both produce irritati...
There rose before us the great pyramid of Gaza.雄伟的加沙金字塔矗立在我们面前。...at the southern end of the Gaza Strip next to the Egyptian border...在紧靠埃及边境的加沙地带南端THE bougainvilleas outside President Mahmoud Abbas's house in Gaza ...
如果症状较轻，试试用非处方药来治疗。If you have only mild symptoms, try an over-the-counter treatment.你在服用其他什么处方药或非处方药吗？Are you taking any other medicines whether on prescription or bought over the counter?我很好奇,这个医生开的是什麽处方药 呢 ?Mark , I wo...